Combination of a light ray with a cytochrome C oxidase substrate particularly for improving the appearance of the skin and/or hair

ABSTRACT

The invention relates to the combination of a light ray with a cytochrome C oxidase substrate for improving the appearance of the skin and/or the hair.

The present invention relates to the field of the care of the skinand/or hair and in particular of the improvement in the appearance ofthe skin and/or hair by light radiation.

The term “skin” is understood to mean the skin of the face and/or of thebody, and also the scalp.

The present invention relates more specifically to a cosmetic treatmentmethod intended in particular to improve the appearance of the skinand/or hair comprising the simultaneous and/or sequentialadministration:

-   -   of at least one cytochrome C oxidase substrate and/or of at        least one agent which increases the expression of the said        substrate; and    -   of at least one light radiation exhibiting at least one        predominant wavelength which activates cytochrome C oxidase.

The cosmetic treatment method according to the present inventioncomprises in particular the simultaneous and/or sequentialadministration, to a subject, in particular to a subject with healthyskin:

-   -   of at least one cytochrome C oxidase substrate and/or of at        least one agent which increases the expression of the said        substrate; and    -   of at least one light radiation exhibiting at least one        predominant wavelength which activates cytochrome C oxidase.

The term “healthy skin” is understood to mean skin not exhibiting aninjury and/or infection.

In particular, the said light radiation according to the inventionexhibits (emits) at least one predominant wavelength which activatescytochrome C oxidase ranging from 550 to 1000 nm (red and infraredemission spectrum), in particular from 550 to 800 nm, preferably from620 to 700 nm and more preferably still from 640 to 680 nm, and ispreferably used at a dose ranging from 0.01 to 200 J/cm², preferablyfrom 0.1 to 30 J/cm², more preferably from 1 to 30 J/cm², indeed evenfrom 5 to 30 J/cm².

The invention also relates to a composition comprising at least onecytochrome C oxidase substrate and/or one agent which increases theexpression of the said substrate and at least one compound exhibitingand/or filtering, in particular under exposure to light, a lightradiation exhibiting at least one predominant wavelength which activatescytochrome C oxidase, and also to a kit comprising at least onecomposition comprising at least one cytochrome C oxidase substrateand/or one agent which increases the expression of the said substrateand a device and/or a compound which emits/filters a light radiationexhibiting at least one predominant wavelength which activatescytochrome C oxidase.

The retaining of a youth appearance and/or healthy skin and/or hair isresulting in an unceasing search for novel compounds and/or for novelnoninvasive treatment methods which make it possible to maintain or toimprove the appearance of the skin and/or hair.

For some years, attention has been directed at aesthetic treatmentsemploying light radiation of visible and/or infrared light, laser or LEDtype, and the like. The term used in particular is “photocosmetictreatment”.

The use by dermatologists and beauticians of lasers and IPL (IntensePulsed Light) to treat signs of skin aging, in particular wrinkles, isknown in particular but these technologies are capable, under someconditions (high intensity and/or long treatment time) of causing damageto the dermis which can bring about erythema, oedema or pain.

The use of the LED (Light-Emitting Diode) is also known, which devicespecifically activates, for a given wavelength, cellular chromophores oracceptors in skin tissue and thereby initiates a cascade of biologicalmetabolisms intended to revitalize/improve/regenerate/stimulate theworking and the appearance of the skin.

Application WO2004/075985 describes in particular treatment methodsemploying light radiation defined in the visible and/or infraredregion(s), optionally in combination with a photosensitizing activeprinciple, for reducing wrinkles, rejuvenating the skin, promotinghealing and repair of the tissues, or treating hypopigmentary disorders.A description is given of the repeated and controlled application inseveral stages of light radiation over periods of several hours.

The need remains to develop systems which are easy to employ and whichdo not exhibit skin damage capable of being generated by an excessiveapplication (nature of the light source, intensity, duration) of lightradiation.

It is this which the Applicant Company has managed to do by combiningthe administration of at least one cytochrome C oxidase substrate and/orone agent which increases the expression of the said substrate and of atleast one light radiation exhibiting at least one predominant wavelengthwhich activates cytochrome C oxidase.

This combination advantageously makes it possible to reduce the durationand/or the intensity of the light radiation administered while stillbeing highly effective.

This is because the Applicant Company has discovered, surprisingly andunexpectedly, that the administration of a cytochrome C oxidasesubstrate in combination with a light radiation exhibiting at least onepredominant wavelength ranging from 550 to 800 nm (emission spectrum ofred light) results in an increased activity of this enzyme and makes itpossible to ensure the satisfactory operation of the mitochondrialrespiratory chain, to increase the production of energy and thus inparticular to combat signs of cell aging and dehydration of the skinand/or hair. The satisfactory operation of the respiratory chain alsomakes it possible to ensure, in return, better protection against thedetrimental change brought about by UV radiation.

Cytochrome C oxidase is present in the various cell types of the skinand hair.

It is known to be involved in the energy metabolism in the mitochondrialrespiratory chain or redox chain which controls the energy level, themetabolism and the homeostasis of the cells.

This enzyme is a photoacceptor activated by red light: when photons areabsorbed by the redox chain, they transfer their energy to therespiratory system resulting, via the change in electrochemicalpotential of the photoactivated cell and the transduction ofintracellular signals mediated by Ca²⁺ and AMPc, in a cascade of eventsin the cell (DNA and RNA synthesis, proliferative activity of the cells)and production of energy in the form of ATP.

This enzyme has the ability to catalyse the transfer of electrons tomolecular oxygen in order to convert it into water molecules withoutforming intermediate free radicals harmful to the cell, according to thefollowing scheme:

Scheme of the Reaction Resulting in the Production of ATP and of WaterMolecules from Oxygen

Cytochrome C, one of its substrates, is a small haem protein having aniron-comprising protoporphyrin IX catalytic site which is associatedwith the inner membrane of the mitochondrion. It is a soluble protein,unlike other cytochromes. It is an essential component of therespiratory chain. Cytochrome C is a highly conserved protein across thespectrum of species, found in plants, animals and many unicellularorganisms. Analogues of it are known under the cytochrome names C1, C2and C3.

Furthermore, it is known that the number of mutations at the level ofthe mitochondrial DNA of skin cells, in particular fibroblasts,increases with age, in particular in sequences encoding cytochromeoxidase (G. S. Gerhard et al., Mechanisms of Ageing and Development,123, 2002, 155-166), having the effect of detrimentally affecting theproduction of energy and of reducing the overall metabolism of the cellsof the skin.

UV radiation is also responsible for an increase in mutations at thelevel of the DNA of the mitochondrial genome, in particular in DNAsequences encoding proteins involved in the respiratory chain of themitochondrion. The detrimental change in these proteins results in areduction in the consumption of oxygen, a variation in the membranepotential, a reduction in the production of ATP and an increase in thesynthesis of MMPs. These mechanisms are reflected in particular by aloss of hydration in the cells of the skin, a deterioration in thecollagen and a reduction in the energy metabolism of the cells.

The combination according to the invention thus makes it possible tomaintain the energy store (ATP) of the cells and production of watermolecules so that all the cell functions are maintained.

The invention thus relates to the combination of at least one cytochromeC oxidase substrate and/or of at least one agent which increases theexpression of the said substrate with at least one light radiationexhibiting at least one predominant wavelength which activatescytochrome C oxidase, in particular a light radiation exhibiting atleast one predominant wavelength ranging from 550 to 1000 nm (theemission spectrum of red and/or infrared light), in a cosmetic treatmentmethod and to a composition or a kit intended in particular to improvethe appearance of the skin and/or hair.

The cytochrome C oxidase substrate and/or the agent which increases theexpression of the said substrate can be formulated in a composition foradministration by the topical route and/or by the oral route.

The light radiation exhibiting at least one predominant wavelength whichactivates cytochrome C oxidase can be in the form of a device or,according to one alternative, in the form of a compound capable ofemitting and/or of specifically allowing to pass, in particular underexposure to light, a light radiation exhibiting at least one predominantwavelength which activates cytochrome C oxidase. In the latter case, thesaid compound which emits and/or filters the said light radiation whichactivates cytochrome C oxidase can be formulated in the same compositionas the cytochrome C oxidase substrate and/or the agent which increasesthe expression of the said substrate or in a separate composition.

The invention thus relates in particular to a cosmetic method intendedin particular to improve the appearance of the skin and/or haircomprising the simultaneous and/or sequential administration:

-   a) of at least one cytochrome C oxidase substrate and/or of at least    one agent which increases the expression of the said substrate;-   b) of at least one light radiation exhibiting at least one    predominant wavelength which activates cytochrome C oxidase.

Advantageously, all the cosmetic methods according to the presentinvention are employed on subjects with healthy skin.

The term “light radiation exhibiting at least one predominantwavelength” is understood to mean, according to the invention, a lightradiation distinct from white light comprising all the wavelengths ofthe spectrum.

This is because it is known that each wavelength has a specific targetin the cells of the skin and/or hair, referred to as chromophore orphotoacceptor.

Specifically, the Applicant Company has shown that certain wavelengthsare capable of activating cytochrome C oxidase, whereas others have noeffect, indeed even are capable of inhibiting it.

Preferably, the light radiation exhibits at least one predominantwavelength ranging from 550 to 1000 nm (emission spectrum of red light550-800 nm and infrared light 800-1000 nm).

In particular, the light radiation exhibits at least one predominantwavelength ranging from 550 to 800 nm (emission spectrum of red light),in particular from 620 to 700 nm and more preferably still from 640 to680 nm.

In particular, use will be made of a light radiation, the emissionspectrum of which has an optimal peak in the vicinity of 660 nm,preferably in the vicinity of 660 nm +/− 100 nm, in particular in thevicinity of 660 nm +/− 40 nm and entirely preferably in the vicinity of660 nm +/− 15 nm.

According to a preferred form, the light radiation exhibiting at leastone predominant wavelength which activates cytochrome C oxidase isapplied to the skin and/or hair, in particular to the areas of skinand/or hair treated with a composition comprising at least onecytochrome C oxidase substrate and/or one agent which increases theexpression of the said substrate, at a dose ranging from 0.01 to 200J/cm², preferably from 0.1 to 30 J/cm².

The term “sequential” is understood to mean a successive (immediate) ordelayed administration.

In the case of a sequential administration, and advantageously, thecytochrome C oxidase substrate and/or the agent which increases theexpression of the said substrate is/are administered before theadministration of the light radiation exhibiting at least onepredominant wavelength which activates cytochrome C oxidase but the saidsubstrate and/or the said agent which increases the expression of thesaid substrate can also and complementarily be administered after asubstrate+light radiation exhibiting at least one predominant wavelengthwhich activates cytochrome C oxidase session.

According to a specific form, the light radiation exhibiting at leastone predominant wavelength which activates cytochrome C oxidase is acompound which emits and/or filters, in particular under exposure tolight or UV radiation, the said light radiation which activatescytochrome C oxidase; the said compound can be formulated in thecomposition comprising the said cytochrome C oxidase substrate and/orthe said agent which increases the expression of the said substrate orelse in another topical composition intended to be applied separately intime (before or after).

According to another form, use is made of a patch, in particular aniontophoretic patch, impregnated with at least one cytochrome C oxidasesubstrate and/or with an agent which increases the expression of thesaid substrate and provided with diodes which emit the said lightradiation which activates cytochrome C oxidase.

The use of the method according to the invention can additionallycomprise a stage, prior to or concomitant with the stages of the methodaccording to the invention, targeted at improving the penetration of thesaid cytochrome C oxidase substrate and/or of an agent which increasesthe expression of the said substrate, for example while cooling theskin, by iontophoresis or by an occlusive system.

It is also possible to promote the penetration of the cytochrome Coxidase substrate and/or of an agent which increases the expression ofthe said substrate by carrying a chemical or mechanical peelingbeforehand on the area to be treated.

Such a combination has the effect of ensuring the satisfactory operationof the mitochondrial respiratory chain and thus makes it possible toincrease the production of energy and to combat in particular signs ofcell aging and dehydration in the skin and/or hair.

The combination according to the invention thus makes it possible inparticular to maintain and/or improve the energy metabolism of the cellsof the skin and/or hair; to maintain and/or improve the hydration of theskin and/or hair; to maintain and/or improve the biomechanicalproperties of the skin (elasticity, firmness, tonicity); to preventand/or treat signs of aging of the skin and/or hair; to improve the skinbarrier function; to promote the regeneration of dermal and/or epidermalcells, in particular to prevent and/or improve the surface condition ofareas affected by chapping and/or frostbite, related, for example, to adeficiency in cell oxygenation (ischemic cell situations caused inparticular by cold and altitude).

According to a specific form, the method according to the invention istargeted at improving the hydration of the skin and/or hair.

According to another form, the method according to the invention istargeted at improving the skin barrier function.

According to yet another form, the method according to the invention istargeted at promoting the regeneration of dermal and/or epidermal cells,in particular improving the surface condition of areas affected bychapping and/or frostbite.

The method according to the invention is also targeted at preventingand/or combating signs of aging of the skin and/or hair.

In particular, the method according to the invention is targeted atalleviating visible or tactile irregularities in the surface of theskin, in particular alleviating wrinkles and fine lines, alleviatingskin blemishes, reducing detrimental changes in the microrelief and/orsmoothing the skin, promoting the regeneration of skin tissue,lightening the complexion and/or improving the lifeless appearance ofthe complexion, maintaining and/or improving the biomechanicalproperties of the skin (elasticity, firmness, tonicity), maintainingand/or improving the hydration of the skin and/or maintaining and/orimproving the texture of the skin.

It is also targeted at preventing and/or treating hair loss, the slowingdown in its growth, its greying, the reduction in the diameter of thehairs and the reduction in the vigour of the hairs.

Cytochrome C Oxidase Substrates and Agents Which Increase the Expressionof the Said Substrate

The term “cytochrome C oxidase substrate” is understood in particular tomean derivatives of compounds having an iron-comprising protoporphyrinIX site.

Mention may in particular be made, as examples according to theinvention, of cytochrome C, its analogues, such as cytochrome C1,cytochrome C2 or cytochrome C3, and their mixtures.

According to a method of the invention, the cytochrome C oxidasesubstrate is chosen from cytochrome C, one of its analogues cytochromeC1, C2 or C3, and their mixtures.

Cytochrome C is sold in particular by Sigma, for example in a kit inwhich it is combined with a cytochrome C oxidase sold under the nameCytocox 1.

It is possible, as an alternative to the use of a cytochrome C oxidasesubstrate or to supplement it, to use an agent which increases theexpression of the said cytochrome C oxidase substrate.

This alternative can be advantageous in responding to possible problemsof formulation of the cytochrome C oxidase substrate.

The term “agent which increases the expression of the said cytochrome Coxidase substrate” is understood to mean any agent (or substance)capable of increasing the expression of the said cytochrome C oxidasesubstrate, in particular by activation of the protein synthesis of thecytochrome C oxidase substrate (in particular via regulation of the geneencoding the said substrate).

The term “agent which increases the expression of cytochrome C” isunderstood to mean any agent (or substance) capable of increasing theexpression of cytochrome C, in particular by activation of the proteinsynthesis of cytochrome C (in particular via regulation of the geneencoding the protein cytochrome C).

Mention may be made, as agent which increases the expression of the saidcytochrome C oxidase substrate, of an agent which increases theexpression of cytochrome C.

Other agents which increase the expression of cytochrome C which can beused according to the invention can be selected by a person skilled inthe art, for example in an in vitro test on human fibroblasts consistingin:

-   -   incubating fibroblasts in a culture medium suited to their        growth and their synthesis activities;    -   bringing them into the presence or not (control) of a sufficient        amount of the test compound, for example 0.1, 1 or 3%;    -   measuring, by immunofluorescent labelling on a cell culture        and/or by Western blotting using an antibody specific for        cytochrome C, the expression of cytochrome C induced by the        presence of the test compound;    -   selecting the compounds for which an increase in the expression        of cytochrome C with respect to the control, preferably an        increase of more than 10%, indeed even of more than 20%, with        respect to the control, is obtained, in particular when the        compound is added at the concentration of 1% in the culture        medium.

According to a first embodiment, the cytochrome C oxidase substrateand/or the agent which increases the expression of the said substrate isformulated in a composition intended for topical administration to theskin.

According to another embodiment, the cytochrome C oxidase substrateand/or the agent which increases the expression of the said substrate isformulated in a composition intended for oral administration.

It can also be advantageous to combine topical and oral administrationsin order to optimize the desired effects.

The said cytochrome C oxidase substrate can be present in a compositionaccording to the invention in a content, as active material, rangingfrom 0.000001 to 20% by weight, with respect to the total weight of thesaid composition.

The said cytochrome C oxidase substrate will generally be present in acomposition of the invention in a content ranging from 0.001 to 20% byweight, with respect to the total weight of the said composition.Preferably, the content will range from 0.01 to 10% by weight andpreferably from 0.01 to 1% by weight, with respect to the total weightof the said composition. Preferably, the said cytochrome C oxidasesubstrate will be present in a composition according to the invention ina content, as active material, ranging from 0.00001 to 2% and, entirelypreferably, the said cytochrome C oxidase substrate will be present in acomposition according to the invention in a content, as active material,ranging from 0.00002 to 0.1%.

The agent which increases the expression of the said cytochrome Coxidase substrate can be present in a composition according to theinvention in a content, as active material, ranging from 0.000001 to 30%by weight, with respect to the total weight of the said composition.

The agent which increases the expression of the said cytochrome Coxidase substrate will generally be present in a composition of theinvention in a content ranging from 0.001 to 30% by weight, with respectto the total weight of the said composition. Preferably, the contentwill range from 0.01 to 20% by weight and preferably from 0.01 to 5% byweight, with respect to the total weight of the said composition.

Preferably, the said agent which increases the expression of the saidcytochrome C oxidase substrate will be present in a compositionaccording to the invention in a content, as active material, rangingfrom 0.00001 to 2% and, entirely preferably, the said cytochrome Coxidase substrate will be present in a composition according to theinvention in a content, as active material, ranging from 0.00002 to 2%.

The highest contents by weight are generally reserved for applicationsin the solid form (for example powder form) or patch form.

Light Radiation Which Activates Cytochrome C Oxidase

The term “light radiation which activates cytochrome C oxidase” isunderstood to mean the light radiation used under conditions(wavelength, intensity, exposure time) such that they can stimulate theenzymatic activity of cytochrome C oxidase in the presence of itssubstrate and/or of an agent which increases the expression of the saidsubstrate and can in particular stimulate the following reactionresulting in production of energy (ATP) and of water molecules.

A light radiation which activates cytochrome C oxidase which can be usedaccording to the invention can be selected according to an in vitrotest, as described in Example 1 below, consisting in:

-   -   exposing or not exposing (control) cytochrome C oxidase and its        substrate (cytochrome C) to light radiation of given        wavelengths, for example at a dose of 2.7 joules,    -   evaluating the effect of the said light radiation on the        activity of the enzyme, with respect to a control, and    -   selecting the light radiation capable of increasing the activity        of the said enzyme, in particular of increasing the activity of        the said enzyme by at least 10%, with respect to the control        kept sheltered from the light.

Specifically, the Applicant Company has been able to show that, while alight radiation exhibiting at least one predominant wavelengthcorresponding to the emission spectrum of red light (dose 2.7 joules) iscapable of activating cytochrome C oxidase (+33%), other wavelengths(for example green light in the vicinity of 535 nm and blue light in thevicinity of 447 nm) do not have an effect.

When light radiation is absorbed by a tissue, it delivers energy to thetissue, which itself reacts with the light radiation according to thewavelength, the intensity and the duration of exposure to the said lightradiation.

The intensity of the light radiation used according to the inventionpreferably does not exceed 150 mW/cm² and is preferably greater than0.01 mW/cm². This intensity range ensures an effectiveness of treatmentover a reasonable period of time, without causing damage to the skintissue treated.

The duration of exposure to the light radiation which activatescytochrome C oxidase will be defined, according to the intensity of thesaid radiation, so that the total energy delivered (dose) to the skinand/or hair is from 0.01 to 200 J/cm², preferably from 0.1 to 30 J/cm²,more preferably from 1 to 30 J/cm², indeed even from 5 to 30 J/cm².

Energy (in joules)=Intensity (in watts)×Time (in seconds).

As nonlimiting example, the duration of exposure to a device emittinglight radiation which activates cytochrome C oxidase can range from 20min to 120 min, preferably from 30 min to 120 min and more preferablystill from 60 min to 90 min.

According to the surface condition of the skin and/or hair to be treatedand the effect desired, it may be advantageous to carry out severalapplications daily of the said light radiation which activatescytochrome C oxidase in combination with the cytochrome C oxidasesubstrate, or one application daily, indeed even one application weekly,for a period of time of one to several months.

According to a preferred form, the light radiation which activatescytochrome C oxidase will in particular be a light radiation exhibitingat least one predominant wavelength ranging from 550 to 1000 nm,preferably from 550 to 800 nm, in particular from 620 to 700 nm, andmore preferably still from 640 to 680 nm, preferably used at a doseranging from 0.01 to 200 J/cm², preferably from 0.1 to 30 J/cm², morepreferably from 1 to 30 J/cm², indeed even from 5 to 30 J/cm².

According to a preferred form, the light radiation exhibiting at leastone predominant wavelength which activates cytochrome C oxidase is thusapplied to the skin and/or hair, in particular to the areas of skinand/or hair treated with the composition comprising at least onecytochrome C oxidase substrate and/or one agent which increases theexpression of cytochrome C, at a dose ranging from 0.01 to 200 J/cm²,preferably from 0.1 to 30 J/cm².

Use may in particular be made, as “light radiation exhibiting at leastone predominant wavelength which activates cytochrome C oxidase” whichcan be used according to the invention, of:

-   -   a light radiation emitted by a device (“physical” source),    -   a light radiation emitted by a compound (“chemical/biological”        source),

and their mixtures.

Devices Emitting a Light Radiation Which Activates Cytochrome C Oxidase

According to a first embodiment of the invention, the light radiationexhibiting at least one predominant wavelength which activatescytochrome C oxidase is emitted by a device.

The said device can be chosen in particular from a device emitting whitelight in combination with a specific filter which allows the saidradiation which activates cytochrome C oxidase to pass; lasers; IPL;LEDs; and their combinations.

In particular, the said device emits a light radiation exhibiting atleast one predominant wavelength ranging from 550 to 1000 nm, inparticular from 550 to 800 nm, and is chosen in particular from: lasers,IPL, LEDs; a device emitting white light in combination with a specificfilter which allows at least one predominant wavelength ranging from 550to 1000 nm to pass (emission spectrum of red and/or infrared light), andtheir combinations.

Mention may in particular be made, as devices emitting a light radiationwhich activates cytochrome C oxidase which can be used according to theinvention, of:

-   -   white light, natural or artificial, in combination with a        specific filter or a screening device which allows at least one        predominant wavelength which activates cytochrome C oxidase (for        example wavelength of the emission spectrum of red and/or        infrared light) to pass: mention may in particular be made of        arc lamps (for example xenon lamp) or incandescent lamps as        examples of devices emitting artificial white light. The term        “natural white light” is understood to mean daylight, which will        be combined with a screening device which specifically allows        predominantly a colour (for example red) which activates        cytochrome C oxidase to pass.    -   lasers (for light amplification by the stimulated emission of        radiation); this is a light source of very high intensity which        is monochromatic. Unlike white light (photons of various        wavelengths emitted randomly at different times and in different        directions), the light radiation emitted by a laser is a light        composed of photons emitted at the same time and in the same        direction.

Three elements characterize lasers: the wavelength (λ); the mode ofemission: continuous (constant power delivered), pulsed (energy isdelivered in pulses, the frequency and the power of which can beadjusted) and ultrapulsed (the pulses have a set duration and power butthe power is considerable and the duration is extremely short); and thepower: from a few mW to tens of thousands of watts.

IPL: Intense Pulsed Light

The fundamental difference between laser and IPL lies in the fact thatIPL can deliver hundreds, indeed even thousands, of colourssimultaneously, whereas the laser delivers only a single wavelength.These machines make it possible to choose the wavelength suited to theproblem to be treated just by changing the filter. They are alsoreferred to as “noncoherent light sources”. Emission of light pulses ofhigh overall intensity is concerned.

This technology can deliver a broad emission spectrum of wavelengthswhich are absorbed by multiple chromophores. Large surface areas can betreated simultaneously.

-   -   LEDs: Light-emitting diodes (photomodulation

(LED, light-emitting diode, see “The newest medical breakthrough forskin renewal and shrinking pores (2004)”).

LED: the LED generally emits low-intensity light of a few milliwatts;they are classified within the category of low-power lasers (power of 1to a few tens of mW).

According to a preferred form, use will be made of devices of LED type.

Mention may in particular be made, as examples of devices of LED typeemitting a light radiation which activates cytochrome C oxidase whichare available commercially of:

-   a) devices capable of being used in particular in institutes for    caring for the skin and/or hair, such as:    -   Omnilux™ system (633 nm) from Photo Therapeutics Ltd.;    -   Lumiphase™ system (660 nm) from Opusmed Inc.;    -   Lightwave system (630 nm and IR 880 nm) from Lightwave        Technologies;    -   Delphia™ and HydroFacial™ (600-700 nm and IR 700-1000 nm)        systems from Edge Systems Corp.;    -   RevitaLight system (625 nm; IR 940 nm) from Skincare Systems        Inc.-   b) devices capable of being used at home, such as those sold in    particular on the Internet (specialist sites or sales sites, such as    e-Bay); mention may be made, for example, of the Mini photon from    Photo Rejuvenation.

The light radiation according to the invention is preferablysubstantially monochromatic (predominant wavelength) with a wavelengthranging from 550 to 1000 nm, preferably from 550 to 800 nm, inparticular from 620 to 700 nm, more preferably still from 640 to 680 nmand better still in the vicinity of 660 nm.

According to a specific form, it can be advantageous to have a devicesequentially emitting a green light radiation and a red or infraredlight radiation, in order to complement the antiaging effects of eitherof these lights.

In this case, the treatment sessions with red light radiation willpreferably be offset in time with respect to the treatment sessions withthe green radiation, in order to avoid any interference between theeffects of the different wavelengths.

The sequential application of two devices emitting at differentwavelengths thus makes it possible to draw part of the benefits of eachlight without interference of one with the other.

Compounds Emitting a Light Radiation Which Activates Cytochrome COxidase

According to another embodiment of the invention or to supplement adevice as described above, the light radiation exhibiting at least onepredominant wavelength which activates cytochrome C oxidase is emittedby a compound chosen from metabolites or active principles emitting, inparticular under exposure to light (visible, UV), such a predominantwavelength which activates cytochrome C oxidase, a compound whichfilters the light in order to specifically allow the said predominantwavelength which activates cytochrome C oxidase to pass, and theirmixtures.

According to a preferred form, the said compound emits a light radiationexhibiting at least one predominant wavelength which activatescytochrome C oxidase ranging from 550 to 1000 nm, preferably from 550 to800 nm, in particular from 620 to 700 nm and more preferably still from640 to 680 nm.

According to a specific form, the said compound emits the said lightradiation when it is exposed to light (visible, UV). This exposure tolight can be an exposure to daylight (“natural” light) or an exposure toan artificial light employing a device. In particular, use will be madeof a device emitting a white or coloured or UV light intended to excitethe said compound in order to allow it to emit the said predominantwavelength (for example red).

The intensity of this exposure to light will be such that it makes itpossible for the said compound to emit the said radiation whichactivates cytochrome C oxidase, in particular at a dose ranging from0.01 to 200 J/cm², preferably from 0.1 to 30 J/cm², more preferably from1 to 30 J/cm², indeed even from 5 to 30 J/cm².

According to another form, the said compound emits a light radiationwithout exposure to the light: this is the case with compounds having anexothermic reaction (thermoluminescence) or compounds having achemoluminescence or bioluminescence reaction.

According to an alternative form, the said compound emits a lightradiation, in particular of infrared type, via an exothermic orthermoluminescence reaction (release of heat), for example by dissolvingCaCl₂ (calcium chloride), ZnCl₂ (zinc chloride) or AlCl₃ (aluminiumchloride). This reaction can take place at the time of the applicationto the skin of an anhydrous composition comprising the said compound,the skin intrinsically comprising an amount of water sufficient totrigger the exothermic reaction.

According to another alternative form, the said compound emits a lightradiation by a chemoluminescence or bioluminescence reaction.

Mention may in particular be made of the bioluminescence reaction ofluciferin in the presence of the enzyme luciferase, of ATP, of a mineral(for example magnesium) and of dioxygen, which exists naturally infireflies:luciferin+ATP+O₂→oxyluciferin+AMP+PP_(i)+light

The compound can also be capable of filtering the light radiation whichactivates cytochrome C oxidase according to the invention when it issubjected to exposure to natural or artificial light.

These chromic phenomena and the corresponding compounds are described inparticular in the reference work “Chromic Phenomena, TechnologicalApplications of Colour Chemistry, Peter Bamfield, The Royal Society ofChemistry, 2001”.

Metabolites and Active Principles Which Emit and/or Filter Red Light

These substances are more particularly metabolites or active principleswhich emit, in particular under exposure to light (visible, UV), lightbetween 550 and 800 nm, preferably from 620 to 700 nm and morepreferably still from 640 to 680 nm.

Mention may in particular be made of:

-   -   red-coloured anthocyanins; red pigments or dyes; iron(III)        complexes;    -   phosphorescent substances;    -   fluorescent substances;        and their mixtures.

Mention may in particular be made, by way of examples, of red-colouredanthocyanins, such as carthamin, cyanidin, delphinidin, pelargonin andbetanin; red polyphenols; lycopene; brazilein, annatto extract, madder,red pigments, iron(III) complexes and their mixtures.

Use will preferably be made of lycopene, delphinidin and their mixtures.

Mention may in particular be made, as red pigments, of carminic acid,laccaic acid, phycoerythrins (algae) and their mixtures.

Mention may in particular be made, as iron(III) complexes, of thecomplexes with salicylic acid and derivatives (salicylates), withantibacterials, such as octopirox, or with thiocyanate, and theirmixtures.

Mention may in particular be made, as phosphorescent substances whichcan be excited under visible or UV light, of phosphorescent pigments.

The term “red phosphorescent pigments” is understood to mean theconventional phosphorescent pigments listed below but also anycosmetically acceptable substance which emits a phosphorescent red lightradiation with a wavelength of between approximately 550 and 800 nm,preferably from 620 to 700 nm and more preferably still from 640 to 680nm.

The presence of phosphorescent pigments provides the composition with acontinuous source of red light, the phosphorescence is activated byexposure to the UV radiation conventionally present in daylight and itseffect lasts several hours.

Mention may in particular be made, as fluorescent substances which canbe excited under visible, UV or near IR light, of fluorescent pigments,such as Nile red (excitation 552 nm/emission 636 nm); glycoconjugated ornonglycoconjugated porphyrin derivatives (excitation 420-440/emission650-680 nm), and their mixtures.

In particular, the metabolites or active principles emitting lightbetween 550 and 800 nm, in particular under exposure to light, can bechosen from red-coloured anthocyanins, such as carthamin, cyanidin,delphinidin, pelargonin or betanin; red-coloured polyphenols; lycopene;brazilein, annatto extract, madder, red pigments, complexes of iron(III)with salicylic acid, octopirox or thiocyanate, red phosphorescentsubstances, red fluorescent substances and their mixtures.

Use will preferably be made of red-coloured anthocyanins and/orlycopene.

Other Compounds Which Filter Red Light

Use may also be made, alternatively and/or in combination with thecompounds emitting a light radiation which activates cytochrome Coxidase described above, of compounds capable of filtering the light inorder to specifically allow the light radiation which activatescytochrome C oxidase to pass.

Mention may be made, by way of example, of holographic pigmentscomprising a polymer matrix in which a volume hologram is recorded,which act as prisms and have the property, on choosing the appropriaterefractive index, of emitting red light when they are illuminated withwhite light. These systems are described by the Applicant Company inApplication FR 0758017.

The volume hologram converts the incident light into one or more beamshaving spatial and spectral dependencies which are a function of theparameters of the hologram.

An example of a volume hologram is the hologram of “Denisyuk” type,which is a reflection hologram which can be obtained in a holographicfilm using a single laser beam, acting both as object beam and asreference beam, as disclosed in Application EP 1 754 968 A2 and on thesitehttp://www.smartholograms.com/site/sections/technology/creating-sensors/htmand in Application EP 1 369 681 A1 (see FIGS. 1 a and 1 b inparticular), these publications being incorporated by reference.

These compounds which filter red light require exposure to natural orartificial light in order to specifically allow the light radiationwhich activates cytochrome C oxidase to pass.

These compounds which emit and/or filter the light radiation whichactivates cytochrome C oxidase can be used at concentrations sufficientto emit and/or ensure the passage of an amount of light radiation whichactivates cytochrome C oxidase.

The said compound emitting and/or filtering, in particular underexposure to light, a light radiation exhibiting at least one predominantwavelength which activates cytochrome C oxidase is present in at leastone of the compositions employed in the method of the invention in acontent ranging from 0.01 to 20% by weight, with respect to the totalweight of the said composition, preferably from 0.1 to 10% by weight,with respect to the total weight of the said composition.

According to a first form, the said compound emitting and/or filtering,in particular under exposure to light, a light radiation exhibiting atleast one predominant wavelength which activates cytochrome C oxidase ispresent in the composition comprising the said cytochrome C oxidasesubstrate and/or the agent which increases the expression of the saidsubstrate.

According to an alternative form, the said compound emitting and/orfiltering, in particular under exposure to light, a light radiationexhibiting at least one predominant wavelength which activatescytochrome C oxidase is present in a composition separate from thecomposition comprising the said cytochrome C oxidase substrate and/orthe agent which increases the expression of the said substrate.

These compounds emitting and/or filtering the light radiation whichactivates cytochrome C oxidase are used in an amount sufficient toensure a light emission flux from 0.1 to a few tens of mW.

A person skilled in the art will adjust the duration of exposure to thislight radiation emitted by the said compound according to thecharacteristics of the said compound and the effect desired.

Purely by way of indication, the areas of skin and/or hair to be treatedcan receive a total energy (dose) delivered to the skin and/or hairranging from 0.01 to 200 J/cm², preferably from 0.1 to 30 J/cm², morepreferably from 1 to 30 J/cm², indeed even from 5 to 30 J/cm².

Examples of cytochrome C oxidase substrates are described above.

In particular, the cytochrome C oxidase substrate is chosen fromcytochrome C, one of its analogues cytochrome C1, C2 or C3, and theirmixtures.

According to a specific form, the cytochrome C oxidase substrate and/orthe agent which increases the expression of the said substrate isformulated in a composition intended for topical administration to theskin.

According to another form, the cytochrome C oxidase substrate and/or theagent which increases the expression of the said substrate is formulatedin a composition intended for oral administration.

Use will preferably be made of topical administration.

In particular, the said cytochrome C oxidase substrate is present in thecomposition in a content ranging from 0.001 to 20% by weight, withrespect to the total weight of the said composition, and the agent whichincreases the expression of the said cytochrome C oxidase substrate ispresent in the composition preferably in a content ranging from 0.001 to30% by weight, with respect to the total weight of the said composition.

A further subject-matter of the invention is a composition comprising,in a physiologically acceptable medium,

-   a) at least one cytochrome C oxidase substrate and/or one agent    which increases the expression of the said substrate, and-   b) at least one compound emitting and/or filtering, in particular    under exposure to light, at least one light radiation exhibiting at    least one predominant wavelength which activates cytochrome C    oxidase.

The said compound emitting and/or filtering, in particular underexposure to light, a radiation exhibiting at least one predominantwavelength which activates cytochrome C oxidase is as defined above. Inparticular, it can be chosen from metabolites and active principlesemitting and/or filtering, in particular under exposure to light, aradiation with a predominant wavelength ranging from 550 to 800 nm,preferably from 620 to 700 nm and more preferably from 640 to 680 nm.

Mention may in particular be made, by way of examples, of red-colouredanthocyanins, such as carthamin, cyanidin, delphinidin, pelargonin orbetanin; red-coloured polyphenols; lycopene; brazilein, annatto extract,madder, red pigments, complexes of iron(III) with salicylic acid,octopirox or thiocyanate, red phosphorescent substances, red fluorescentsubstances and their mixtures.

Use will preferably be made of red-coloured anthocyanins, lycopene andtheir mixtures.

In particular, the compound emitting and/or filtering, in particularunder exposure to light, a light radiation exhibiting at least onepredominant wavelength which activates cytochrome C oxidase is presentin the composition in a content ranging from 0.01 to 20% by weight, withrespect to the total weight of the said composition.

According to a preferred form, the cytochrome C oxidase substrate ischosen from cytochrome C, one of its analogues cytochrome C1, C2 or C3,and their mixtures.

In particular, the cytochrome C oxidase substrate and/or the agent whichincreases the expression of the said substrate is present in thecomposition in a content ranging from 0.001 to 30% by weight, withrespect to the total weight of the said composition.

The composition can be a cosmetic or pharmaceutical composition.

It will preferably be a cosmetic composition.

According to a first embodiment, the composition is intended for topicalapplication to the skin and/or hair.

According to another embodiment, the composition is intended for oraladministration.

The composition can also comprise an agent which promotes thepenetration of the said compounds, such as solvents, desquamating agentsand their mixtures.

A person skilled in the art will take care that the choice of theseadditional ingredients is compatible with the application of a deviceemitting a light radiation which activates cytochrome C oxidase and doesnot detrimentally affect the desired properties.

A further subject-matter of the invention is a kit comprising:

-   a) a composition comprising at least one cytochrome C oxidase    substrate and/or one agent which increases the expression of the    said substrate and at least one compound capable of emitting and/or    filtering a light radiation exhibiting at least one predominant    wavelength which activates cytochrome C oxidase;-   b) a first device which makes it possible for the said compound    present in the first composition to emit and/or filter the said    light radiation exhibiting at least one predominant wavelength which    activates cytochrome C oxidase.

According to an alternative, the invention relates to a kit comprising:

-   a) a first composition comprising at least one cytochrome C oxidase    substrate and/or one agent which increases the expression of the    said substrate;-   b) a second composition comprising at least one compound capable of    emitting and/or filtering a light radiation exhibiting at least one    predominant wavelength which activates cytochrome C oxidase;-   c) optionally a first device which makes it possible for the said    compound present in the second composition to emit and/or filter the    said light radiation exhibiting at least one predominant wavelength    which activates cytochrome C oxidase.

In the case of a compound capable of emitting the light radiation whichactivates cytochrome C oxidase, the first device excites the saidcompound so as to cause it to emit the said light radiation whichactivates cytochrome C oxidase.

The said first device can in particular be:

-   -   a device which emits a light radiation exhibiting wavelengths of        visible, UV and/or near IR light,    -   a separate composition intended to be applied to the skin and/or        hair comprising an additional compound necessary for the        chemoluminescence, bioluminescence or thermoluminescence        reaction with the said compound.

In particular, the first device can be a device which emits a lightradiation exhibiting wavelengths of visible and/or UV light, accordingto the nature of the compound present in the second composition. Thedevice can emit a light radiation chosen from white light, a colouredlight and a UV light. Preferably, the light radiation will be visiblelight and in particular red light.

In the case of a compound capable of filtering the light radiation whichactivates cytochrome C oxidase, the first device is generally a lightradiation which is filtered by the said compound to give a lightradiation which activates cytochrome C oxidase.

According to a specific form, the kits described above can additionallycomprise a second device emitting a light radiation exhibiting at leastone predominant wavelength which activates cytochrome C oxidase.

The invention also relates to a kit comprising:

-   a) a composition comprising at least one cytochrome C oxidase    substrate and/or one agent which increases the expression of the    said substrate;-   b) a device emitting a light radiation exhibiting at least one    predominant wavelength which activates cytochrome C oxidase.

The device emitting a light radiation exhibiting at least onepredominant wavelength which activates cytochrome C oxidase is chosen inparticular from a device emitting white light in combination with aspecific filter which allows the said light radiation which activatescytochrome C oxidase (in particular a light radiation exhibiting atleast one predominant wavelength corresponding to the emission spectrumof red and/or infrared light) to pass, lasers, IPL, LEDs and theircombinations.

The cytochrome C oxidase substrate and/or an agent which increases theexpression of the said substrate are as described above.

Examples of compounds which emit and/or filter, in particular underexposure to light, a radiation exhibiting at least one predominantwavelength which activates cytochrome C oxidase are described above.

The kit according to the invention can be a cosmetic kit or apharmaceutical kit.

Preferably, it will be a cosmetic kit.

The constituent compositions of these kits can be compositions intendedfor topical or oral administration.

Preferably, they will be compositions intended for topicaladministration.

Formulation

The compositions employed in the method, the composition or the kitaccording to the invention as described above are intended for topicaland/or oral application.

The composition generally comprises a physiologically acceptable medium,that is to say a medium compatible with the skin and/or its superficialbody growths. It is preferably a cosmetically acceptable medium, that isto say a medium which exhibits a pleasant smell, a pleasant colour and apleasant feel and which does not cause unacceptable discomfort(smarting, red blotches, tightness) liable to dissuade the consumer fromusing this composition.

For oral administration, in particular in an “oral cosmetic”, thecomposition can be provided in particular in the form of capsules,including hard gelatin capsules, tablets, including sugar-coatedtablets, granules, chewing gum, gels, syrups to be taken orally or anyother form known to a person skilled in the art.

Preferably, the composition is a topical composition.

The term “topical composition” is understood to mean a compositionintended for local application to any surface area of the body,including the skin, the mucous or semi-mucous membranes, the scalp orthe hair.

For topical application to the skin, the composition can have the formof an aqueous, aqueous/alcohol or oily solution which is optionallygelled, of an emulsion with a liquid or semi-liquid consistency of themilk type, obtained by dispersing a fatty phase in an aqueous phase(O/W) or vice versa (W/O), of a triple emulsion (W/O/W or O/W/O), of asuspension or emulsion with a soft, semi-solid or solid consistency ofcream or gel type, of a liquid, pasty or solid anhydrous product, ofmicroemulsions, of microcapsules, or microparticles, of a vesiculardispersion of ionic type (liposomes or oleosomes) and/or nonionic type(niosomes) and/or of a dispersion of minute spheres.

It is also possible to envisage a composition in the foam form or alsoin the spray or aerosol form then comprising a pressurized propellant,or also in the patch or impregnated pad form.

The composition can thus be provided in the form of a lotion, serum,milk, O/W or W/O cream, gel, ointment, salve, powder, balm, patch,impregnated pad, soap, bar or foam.

According to the area of the body targeted and the intensity ofapplication desired, a person skilled in the art can choose fromdifferent composition forms:

-   -   a composition intended to remain applied to the skin even after        the exposure to the light radiation exhibiting at least one        predominant wavelength which activates cytochrome C oxidase;        this composition can be a dispersion of the lotion or gel type,        an emulsion with a liquid or semi-liquid consistency of the milk        type, obtained by dispersing a fatty phase in an aqueous phase        (O/W) or vice versa (W/O), a suspension or emulsion with a soft,        semi-solid or solid consistency of the cream or gel type, a        multiple emulsion (W/O/W or O/W/O), a microemulsion, a vesicular        dispersion of ionic and/or nonionic type, or a wax/aqueous phase        dispersion;    -   a composition which remains in contact with the skin only        throughout the duration of the exposure to the said light        radiation which activates cytochrome C oxidase, such as a mask,        in the form of a cream which the user can specifically apply to        the area to be treated and can then subsequently remove, or a        patch impregnated with a substrate; in this administration form,        the masks or patches have to be sufficiently transparent to        allow the light which activates cytochrome C oxidase to pass        through.

The invention will now be illustrated by the following nonlimitingexamples.

FIG. 1: set-up of the in vitro test on the activation of cytochrome Coxidase by red light.

FIG. 2: red limit emission spectrum used in the examples.

Example 1 Activation of Cytochrome C Oxidase by a Specific LightRadiation (Emission Spectrum of Red Light)

The following example measures the stimulating effect of a lightradiation exhibiting a predominant wavelength ranging from 550 to 800nm, in particular from 620 to 700 nm, on the activity of cytochrome Coxidase.

The exposure of this enzyme to the said light radiation stimulates theproduction of molecules of ATP and of water according to the followingchemical reaction:

Description of the Protocol

General principle: the principle of these studies is to compare theactivity of cytochrome C oxidase with or without prior exposure to alight radiation exhibiting a wavelength ranging from 620 to 700 nm.

Equipment and Reagents

-   -   light source, with optical fibre (internal diameter 3 mm) and        IL-1700 photometer+SED 033 probe (#6600): produces a light        radiation, the emission spectrum of which is presented in FIG.        2;    -   cytochrome C (0.22 mM) and cytochrome C oxidase (0.32 U/ml):        Cytocoxl kit from Sigma.

The reduction of the protein takes place by addition of the 0.1M DTT(dithiothreitol) solution, i.e. a final concentration of 0.5 mM.

The absorbance is measured at 550 nm and at 565 nm: the A550/A565 ratiohas to be between 10 and 20 (controls the conformity of the startingsolutions).

Mode of Exposure of the Enzymes

The enzyme (dehydrated powder form or enzyme solution) is placed in aconical Eppendorf tube. The amount is adjusted so that the enzymes intheir entirety are subjected to the light radiation (wavelengths ofbetween 620 and 700 nm) by an optical fibre with a diameter of 3 mm.Exposure to light is continuous and the energy provided by the light is0.45 mW/cm² (see FIG. 1: set-up diagram, and FIG. 2: emission spectrumof the red light used in the tests).

The Eppendorf tubes are placed in an ice bath throughout the duration ofthe exposure in order to avoid an effect of the temperature. The controlenzyme (not exposed to the said light radiation) is prepared at the sametime and in the same way and is protected from the said light radiationby a backing which prevents external light from making a contribution(aluminium paper).

The cytochrome C oxidase is exposed to the light radiation (duration of30 to 90 min), i.e. an equivalent dose of between 0.8 joule/cm² and 2.4joule/cm², in solution at a concentration of 0.15 U/ml in a Tris-HCl, pH7, buffer comprising 0.5 mM of sucrose.

After exposure, the cytochrome C oxidase is incubated with itssubstrate, ferrocytochrome C Fe²⁺, in a mixture comprising 10 mM ofTris-HCl, pH 7, and 120 mM of KCl. The activity of the enzyme isevaluated from the beginning of the reaction.

Measurement of Activity of the Enzyme

The absorption of cytochrome C at 550 nm varies with its oxidationstate.

This property forms the basis of our measurement test. Cytochrome C isreduced with dithiothreitol and reoxidized with cytochrome C oxidase.

125 μl are placed in Eppendorf tubes for the control and 125 μl areplaced in Eppendorf tubes for the test sample.

The test sample is then placed under light radiation for a duration of90 minutes.

The variation in the absorbance A550/min is then measured.

The enzymatic activity is then calculated according to the followingformula:U/ml=(dA/min×dil×1.1)/(vol of enzyme)×21.84).

The light radiation emitting a predominant wavelength in the redsignificantly stimulates the activity of cytochrome C oxidase (+33%) foran irradiation time of 90 min, i.e. a dose equivalent to 2.4 joule/cm².

Example 2 Formulation Examples

Compositions Combined with a Device

The formulations described below will be applied to the face or to thebody immediately before prolonged exposure (30 min to 1 h 30) to a lightradiation exhibiting at least one predominant wavelength ranging from550 to 1000 nm, preferably from 620 to 700 nm. Use will be made, forexample, of a device of Omnilux™ system type (633 nm) from PhotoTherapeutics Ltd or a device of Lightwave™ system type (630 nm and 880nm) from Opusmed Inc.

Care cream for the skin: oil-in-water emulsion Ammoniumpolyacryldimethyltauramide 1.00% (Hostacerin AMPS from Clariant)Cyclohexasiloxane  5.0% Glycerol 1.70% Stearyl alcohol 0.30% Glycerylstearate/PEG-100 stearate 0.70% Dimyristyl tartrate/cetearylalcohol/C12-15 0.50% pareth-7/PPG-25 laureth-25 Xanthan gum 0.20%Cytochrome C  0.5% Preservatives 0.50% Water q.s. for 100 Care cream forthe skin: oil-in-water emulsion Ammonium polyacryldimethyltauramide1.00% (Hostacerin AMPS from Clariant) Cyclohexasiloxane  5.0% Glycerol1.70% Stearyl alcohol 0.30% Glyceryl stearate/PEG-100 stearate 0.70%Dimyristyl tartrate/cetearyl alcohol/C12-15 0.50% pareth-7/PPG-25laureth-25 Xanthan gum 0.20% Cytochrome C (as active material) 0.0175% Preservatives 0.50% Water q.s. for 100Iontophoretic Patch

According to another embodiment, a commercial reference patchIontopatch™ (Travanti Pharma, Mendota Heights, Minn., USA) is applied toan area treated beforehand with one of the above creams.

It is subsequently connected to an electric current for delivering agalvanic current generated by a difference in potential of 1 V andcomprising two electrodes, a Zn anode and an AgCl cathode, and isexposed to a light radiation exhibiting at least one predominantwavelength ranging from 550 to 1000 nm.

This treatment is carried out at the rate of once daily for 30 to 45minutes.

Red Mask (1)

Oily Phase:

Octyldodecanol 6% Apricot kernel oil 6% Triglycerides 5% Kaolin 3% Cetylalcohol 2% Vitamin E acetate 0.5% Hydrogenated palm oil 6% Liquidfraction of shea butter 5%Aqueous Phase:

Xanthan gum 0.4% Sucrose cocoate/sorbitan stearate 5.5% (mixture sold byICL under the name Arlaton 21121) Glycerol   3% Dipyridamole 0.30% Ethanol   5% Cytochrome C 0.1% Delphinidin 0.4% Fragrance 0.3%Preservative q.s. Water q.s. for 100Red Mask (2)Oily Phase:

Octyldodecanol 6% Apricot kernel oil 6% Triglycerides 5% Kaolin 3% Cetylalcohol 2% Vitamin E acetate 0.5% Hydrogenated palm oil 6% Liquidfraction of shea butter 5%Aqueous Phase:

Xanthan gum 0.4% Sucrose cocoate/sorbitan stearate 5.5% (mixture sold byICL under the name Arlaton 21121) Glycerol   3% Dipyridamole 0.30% Ethanol   5% Cytochrome C (as active material) 0.00002%   Delphinidin0.4% Fragrance 0.3% Preservative q.s. Water q.s. for 100

The mask is applied to the areas of the skin to be treated and then thesubject is placed under a source of white light (natural or electrical)for from 45 minutes to 1 hour.

The invention claimed is:
 1. A method of improving the appearance ofskin and/or hair comprising: a) administering at least one cytochrome Coxidase substrate and/or at least one agent which increases theexpression of at least one cytochrome C substrate to the external skinand/or the hair of a subject; and b) administering light radiationhaving a peak wavelength of 550 to 800 nm which activates cytochrome Coxidase to cells in the external skin and/or the hair of the subject,wherein the light radiation is administered to cells in the externalskin and/or hair of the subject at a dose of from 1 to 30 J/cm², whereinthe light radiation exhibiting the peak wavelength which activatescytochrome C oxidase is emitted by at least one compound selected fromthe group consisting of a metabolite emitting a peak wavelength whichactivates cytochrome C oxidase, an active principle emitting a peakwavelength which activates cytochrome C oxidase, a compound whichfilters light to allow the peak wavelength which activates cytochrome Coxidase to pass, and mixtures thereof.
 2. The method according to claim1, in which the light radiation exhibiting the peak wavelength whichactivates cytochrome C oxidase is administered to cells in the skinand/or hair at a dose ranging from 5 to 30 J/cm².
 3. The methodaccording to claim 1, in which the light radiation exhibiting the peakwavelength which activates cytochrome C oxidase is further emitted by atleast one device selected from the group consisting of a device emittingwhite light in combination with a specific filter which allows the lightradiation exhibiting the peak wavelength which activates cytochrome Coxidase to pass, lasers, IPL, and LEDs.
 4. The method according to claim1, in which the compound emits and/or filters a light radiationexhibiting the peak wavelength which activates cytochrome C oxidaseranging from 620 to 700 nm.
 5. The method according to claim 4, in whichthe compound emitting and/or filtering the light radiation exhibitingthe peak wavelength which activates cytochrome C oxidase ranging from620 to 700 nm is at least one selected from the group consisting ofred-coloured anthocyanin, polyphenol, lycopene, brazilein, annattoextract, madder, red pigment, a complex of iron(III) with salicylicacid, octopirox, thiocyanate, a red phosphorescent substance, and a redfluorescent substance.
 6. The method according to claim 1, in which thecompound emitting and/or filtering a light radiation exhibiting the peakwavelength which activates cytochrome C oxidase is present in acomposition in a content ranging from 0.01 to 20% by weight, withrespect to the total weight of the composition.
 7. The method accordingto claim 1, in which the compound emitting and/or filtering a lightradiation exhibiting the peak wavelength which activates cytochrome Coxidase is present in a composition which further comprises thecytochrome C oxidase substrate and/or at least one agent which increasesthe expression of the substrate.
 8. The method according to claim 1, inwhich the compound emitting and/or filtering a light radiationexhibiting the peak wavelength which activates cytochrome C oxidase ispresent in a first composition and the cytochrome C oxidase substrateand/or at least one agent which increases the expression of thesubstrate is present in a second composition.
 9. The method according toclaim 1, in which the cytochrome C oxidase substrate is at least oneselected from the group consisting of cytochrome C, cytochrome C1,cytochrome C2 and cytochrome C3.
 10. The method according to claim 1, inwhich the cytochrome C oxidase substrate and/or the agent whichincreases the expression of the substrate is formulated in a compositionsuitable for topical administration to the skin.
 11. The methodaccording to claim 1, in which the cytochrome C oxidase substrate and/orthe agent which increases the expression of the substrate is formulatedin a composition suitable for oral administration.
 12. The methodaccording to claim 1, in which the cytochrome C oxidase substrate ispresent in a composition in a content ranging from 0.001 to 20% byweight, with respect to the total weight of the composition.
 13. Themethod according to claim 1, in which the agent which increases theexpression of the cytochrome C oxidase substrate is present in acomposition in a content ranging from 0.001 to 30% by weight, withrespect to the total weight of the composition.
 14. The method accordingto claim 1, wherein the improvement of the skin and/or hair is at leastone selected from the group consisting of alleviating wrinkles and finelines, alleviating skin blemishes, reducing detrimental changes in themicrorelief, smoothing the skin, promoting the regeneration of skintissue, lightening the complexion, improving the lifeless appearance ofthe complexion, maintaining the biomechanical properties of the skin,improving the biomechanical properties of the skin, maintaining thehydration of the skin, improving the hydration of the skin, maintainingthe texture of the skin, and improving the texture of the skin.
 15. Themethod according to claim 1, wherein the at least one cytochrome Coxidase substrate and/or at least one agent which increases theexpression of the substrate and the light radiation exhibiting the peakwavelength which activates cytochrome C oxidase are administeredsimultaneously.
 16. The method according to claim 1, wherein the atleast one cytochrome C oxidase substrate and/or at least one agent whichincreases the expression of the substrate and the light radiationexhibiting the peak wavelength which activates cytochrome C oxidase areadministered sequentially.